Diagnostic Trouble Code (DTC) Information
DTC information
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 998 8686 Replaced by 9511532 998 8686 Replaced By 9511532
Condition
The transmission speed signal is sent by a sensor on the transmission. The transmission control module (TCM) uses the signal to determine the input shaft speed after the torque converter. This signal is used to compare the transmission speed with vehicle speed. The transmission control module (TCM) uses this comparison to calculate gear-shift timing. The transmission speed and vehicle speed data are also utilized in modulating system pressure, lock-up function control and in torque limiting. The result is smooth gear-shifting. Diagnostic trouble code (DTC) AT-311 is posted if the transmission control module (TCM) does not register this signal when vehicle speed exceeds 25 km/h.
Substitute value
The transmission control module (TCM) "Emergency mode II" program is initiated.
Possible source
- Open-circuit in the signal cable (+) or signal cable (-).
- Short-circuit to supply voltage or ground in the signal cable
- Short-circuit to supply voltage in the signal cable (-).
- Short circuit between the signal (+) wiring and signal (-) wiring.
- Defective speed sensor
- Contact resistance in terminals
Fault symptom[s]
- The combined instrument panel warning lamp flashes.
- No lock-up function.
- No adaption of the gear slippage times at high altitude (High Altitude Compensation)
- No reduction of system pressure when shifting, making shifting harsher.
- No reduction of system pressure when moving the gear selector between positions P-R, N-R and N-D which causes harsh gear meshing.
- No torque limiting request to engine control module (ECM) when shifting
Note! The Motronic 4.4 engine control module (ECM) posts a diagnostic trouble code (DTC) when the transmission sends a malfunction indicator lamp (MIL) request. Erase this diagnostic trouble code (DTC) in the Motronic engine control module (ECM) when the transmission fault has been repaired.